Thats the funniest thing I have seen in a while.
A product that is useless for the advertised purpose.
The big brother drones the advertiser fly at far greater heights than 3500' they are quiet and impossible to see let alone shoot with any kind of shot gun.
Perhaps the small quad-drones that have been used to spy on pig farms etc could be a target, but you do not need special ammo….just be a good shot.
No doubt they will sell plenty of it.